There is many converters outhere for android that are not able to convert many files at once..
So I searched and found this one
It very cool
It has the ability to convert many files at once..
For example if you want to get your hands on loops from the Music maker jam app
They are very cool, They are free, there is a lot of them But they are ogg..
So you Instal this
Instal music maker jam
Find some packs from their style gallery
Find them in your android folder
They should be there somwhere
In a folder of soundpools
Then simply add them all in this app an convert them to wave..
I hope this helped someone somewhere